Expansion joint for pavements anx



Dec. 7, 1937.

c. OLDER Re. 20,575

Fo N'rs HE L r @Qzvir' gawd-@Mm UNITED STATES PATENT ori-ice EXPANSION JOINT FOR PAVEMENTS AND THE LIKE Cliffnrd older, Wilmette, nl.

Original No. 1,918,554, dated July 18, 1933, Serial No. 555,949, August 8, 1931. Application for reissue June 15, 1935, Serial No. 26,852

The present invention relates to expansion strip to crack along the sharp edge between the joints for pavement and the like and is particusections of concrete. Unless provision is made larly concerned with expansion joints for confor taking care of this tendency the fold in the crete roads and the likeexpansible metal strip ultimately takes the form 5 'I'he concrete pavements of the prior art are of asharp bend, the metal then becomes pinched 5 ordinarily constructed in a plurality of sections or creased and cracked and the purpose of the with cracks between the sections and with subexpansible J'Oint i`S defeated.' stantially larger expansion cracks located at One of the objects of the present invention is regular intervals for the purpose of permitting the elimination of the foregoing difilculties by the ll the longitudinal expansion of the pavement under provision of an improved expansion joint of rela- 10 changes of temperature of the pavement. Extively Simple and economical ccnstiucticn Which pension joints of this type may be installed to is adapted to permit relative movement between permit initial expansion or contraction, dependadjacent sections of the pavement andto prevent y ing upon the result desired, the filling of the cracks between the sections with i When the separate sections of the pavement dirt or other foreign material. 15 expand, there is a gradual sliding of the sections Ancther Object 0f the invention 1S the DIcVlSiOi'l toward the expansion l crack or joint, but when' of a plurality of improved and simpliiied forms of the sections subsequently contract, they do not expansion joints adapted t0 positively prevent the tend to return to their former position. This formation of a sharp bend, fold or crease, and to results in the disappearance of the relatively wide prevent the pinching 0f the Sheet metal of the 20 expansion crack, and the space utilized by the J'eint by the foreign material filling the crack. s0 wide expansion crack is soon divided into a pluthat the expansible metal jcint Will 110i'- be cracked rality of cracks formed between adjacent sections 01' broken after a lcng period 0f service.

of the pavement, and it is practically impossible Another object of the invention is theprovision Q5 to prevent this action of the pavement sections 0f a plurality of forms 0f metal expansion J'OiltS 25 in closing up the expansion joints. Y for pavement, or the like, which are not only The open expansion joints and cracks between- Q adapted t0 Secure the adjacent InOvable SecticrlS adjacent sections soon become filled with dust, 0f concrete tcgether. but are alSc adapted t0 aet soil and sand particles, and as this material is as a division plate fOr producing a crack at a generally incompressible it follows that when expredetermined Pcint in the pavement. 30

pansion again takes place, the joints cannot close Another Object 0f the iuveiiticn iS the DTOVSOII between the adjacent sections and the whole of a plurality of improved forms of expansion series of sections is pushed still further toward strips, the folds of which are provided with cylinthe expansion joint, until eventually all of the drical DOltlOl'lS having a llng Which DcSitiVely joints, including the `expansion joint, have beprecludes the folds from being forced into a sharp 35 come lled with hard packed unyielding material. bend or crease, thereby preventing the cracking The purpose of the expansion joint is then deof the strips at this point. feated and further expansion of the concrete sets Another object of the invention is the provision up compression stresses as great as there would of an expansion Strip adapted t0 be used With my 40 be in case no expansion joint had been provided improved division plates or with any of the mod- 40 in the first place. ern parting plates.

Another diillculty encountered in providing ex- Another object of the invention is the provision vpansion joints lies in the fact that the continuof an expansion strip and parting plate assembly ous expansion and contraction of the concrete peculiarly adapted tctake care 0f initial eXpanpermits the sand, soil and other material to get sion without any possibility 0f the main fcld cf 45 in between the sections of concrete and the folds the expansion strip being squeezed into a crack of the expansible metal joint. As the space vbeby the adjacent sections of concrete. tween the concrete sections around the expansible Other objects and advantages of the invention metal becomes filled with hard packed material, will be apparent from the following description ,-.0 the expansible fold itself becomes compressed and from the accompanying drawings, in which between the sections of concrete and hard packed similar characters of reference indicate similar material in the crack with the result that the parts throughout the several views.

easy curve, preferably provided between the folds Referring to the drawings, of which there arer of the expansible joint, becomes pressed to a three sheets, v

' sharp edge, thereby causing the expansible metal Fig. 1 is a fragmentary sectional view of a pave- 55 tected;

Fig. 5 is a similar view of another modification with a different form of parting strip;

Fig. 6 is a fragmentary sectional view of a concrete pavement immediately after the placing of one of the expansion strips and the parting strip by means of a special template;

Fig. 7 is a fragmentary sectional view of another modified form oflexpansion joint;

Fig. 8 is a similar View of a modified form of expansion joint peculiarly adapted to permit initial expansion of the concrete;

Fig. 9 shows a similar View of another modification;

Fig. 10 is a similar view of another modification;

Fig. 11 is a fragmentary sectional view of another modification, Vhaving. a dowel plate to maintain the alignment of the pavement sections;

Fig. 12 is a similar view of another modification;

Fig. 13 is a similar view of another modification in which a cellular paper filler is used to provide a space for the initial expansion of the concrete sections;

Fig. 14 is a similar view of another modication of the same type;

Fig. 15 is a similar view of another modification.

Referring to Fig. 1, the concrete sections 26, 2| are shown in connection with an expansion strip indicated in its entirety by the numeral 22` and a parting strip 23. The expansion strip 22 may be used with or without parting strips and it is adapted to be used with any of a multiplicity of diierent types of parting strips, some of the most important of which are illustrated.

The expansion strip 22 is preferably formed with a pair of inwardly extending flanges 24, 25, having downwardly or upwardly bent ends 26 forming anchoring formations secured in the concrete sections 20, 2|. The flanges 24 and 25 are joined to upwardly extending flanges 21, 26 which terminates in substantially cylindrical beads 29, 30.

The beads 29 and 30 constitute auxiliary lfolds ln the expansion strip 22 but the main fold of the expansion strip is provided by the downwardly extending flanges 3|, 32 which are joined by the central portion 33 of the strip and the-central portion 33 extends preferably below the wings 24, 25 to prevent the pinching of this fold by the adjacent parts of the sections of concrete 20 and 2|. The `.flanges 3| and 32 of Fig. 1 diverge slightly to form a wedge shaped opening capable of receiving a removable steel bar 34, or a semiplastic bitumen filler which may be left in place,

if desired.

The circular folds 29 and`30 are preferably filled with metal wires`35 so as to positively preclude these folds fromV being compressed into a sharp crease which would result in the cracking of the fold and these folds are preferably anchored in the concrete as shown in Fig. 1. It will be noted that the concrete has been rounded oil ment showingl one'form of expansion joint with a .simple parting strip;

, tion in the green concrete.

at 36 on each section 20, 2| and the anges 3| and 32 may serve as guides in the edging operation or the metal bar 34 may be used as a guide. It will be noted, however, that the concrete extends downward at the point 31 inside of each of the beadsf29, 30 and, under ordinary conditions, the beads 29, 30 should remain anchored in the concrete and the principal bending should take place at the lower portion 33 of the strip 22.

Under some conditions however, the beads 29 and 3B may be pulled out of the adjacent sections of concrete but, in any event, it will be practically impossible for the dirt, sand and other compressy ible material which gathers about the joint to compress these beads into a sharp crease. One of the principal defects of the expansion strips of the prior art was the inability of such strips to prevent this creasing or cracking action.

The parting strip 23 may consist of a plane metal strip which is resiliently clamped between the flanges 2B and 32 or flanges 21 and 3|, and adapted to insure the location of the crack 38 at the expansion joint. If desired, the parting strip 23 may be formed with a laterally extending trough 39 for shaping the joint between the sections in such manner that the sectionswill bey maintained in alignment with each other.

The main fold 33 of the expansion strip 22 preferably extends lower. than the flanges 24, 25 so that this fold would not be pinched by the adjacent flanges 3| and 32.

Referring to Fig. 2, this is a similar view of the expansion strip during the course of its installa- The expansion strip is supported upon a template which may be indicated in its entirety by the numeral 4|) and which consists preferably of a exible body 4| of metal or lumber which may be provided with a metal bar 42 xedly secured to its lower side for tele. scopically engaging the flanges 3|, 32 or with-a channelled metal member 43 having flanges 44, 45 for engaging the sides of the tapered bar 42 when a loose bar or filler is used.

The body 4| of the template 4|] is sufficiently flexible to conform .to the actual crown of the concrete rather than the theoretical curve desired and the lower fiat surface 46 of the template acts as a gauge surface for locating the expansion strip 22 at a predetermined depth below the surface of the concrete when the surface 46 engages the top of the concrete. The template body 4| is provided with bores 41 and with metal guides 48 for slidably receiving the rods 49 and 50.

Each rod is preferably provided with a laterally bent upper end 5|, 52 forming a handle and the i rods are urged upward by helical compression springs 53, 54 which are compressed between the upperl ends ofthe guides 46 and the washers 55. The lower end of the rods or plungers 49, 5D are provided with a plurality of laterally extending portions 56, 51, 58 adapted to engage parts of the expansion strips 22 to hold it against the template. The groove 59 in the end 56 engages the anchoring formation 46 on flange 24. Groove 60 in laterally extending portion 49 engages the other anchoring portion 56 of flange 25. Groove 6| on the laterally bent end 51 engages the lower edge of'. the parting plate 23. The expansion strip assembly is secured to the template by locating it in a position shown in Fig. 2 with respect to template 40 and then pushing the plungers 49 and 53 downward l beyond the flanges and parting plate 23 and rotating the plungers 49 and 50 until preferably has prepared handles 52 at each end or it may be supported'from a stirrup by cables leading to its half and quarter points.

The expansion joints described herein which merely consist of an upper unit and a parting strip may be installed by the use of such a ternplate by forcing theparting strip and the expansion strip down into the wetfand green concrete just after the surface of the concrete has been finished. The engagement between the lower at surface 46 on the template and the upper fiat surface of the concrete determines the final position of the parting plate and expansion strip. The plungers 49 and 50 are thus pushed downward and rotated to release the parting plate and expansion strip and the template is removed.

In some cases, the bar 42 is removedwith the template but in other cases it may be left and used as a guide in finishing the adjacent edges 36. The holes left by the plungers are, of course, filled up' by smoothing the adjacent surface with atrowel or other tool.

Referring to Fig. 3, this is a modified form of construction in which the flanges 24 and 25 are provided'with backwardly vbent portions 62 and 03 spaced sufficiently from the flanges 24 and 25 j to receive the anges 64 and 65. The expansion joint of Fig. 3 is adapted to permit initial expansion of the concrete sections and is, therefore, provided with a. special parting plate which may be indicated in its entirety by the numeral' 66. The parting plate 68 comprises two parallel flanges 81 and 68 joined by a yoke 59 which may be located at the lower surfacel of the concrete,

The parallel flanges 61, 68 are provided with outwardly extending offset portions 69, 10 forming an enlarged space 1| between the anges 12, 13. The flanges 12, 13 support the laterally extending fianges 64 and 65 which are adapted to be received in between anges24. I62 and 25, 63. 'I'he parting plate unit 66 may thus be sprung together until its feet 84, 65 are engaged in the grooves formed by flanges 24, 62 and 25, 03. This expansion joint assembly provides a space 14 between the adjacent sections 20` 2| of concrete so that the concrete may expand to fill the space 14. The enlarged space 1| is adapted to prevent the adjacent anges 12, 13 engaging the main fold 33 of the expansion strip when such initial expansion takes place. The adjacent ends of the concrete sections cannot, therefore, force the fold 33 into a sharp crease, and the cracking of this fold is thus prevented. f

Referring to Fig. 4 this is another modification in which the same type of expansion strip 22 is utilized at the top and bottom of the concrete. In this embodiment, a division plate 23 is resillently engaged by the flanges 21 and 3| of each expansion strip 22, and it will thus be apparent that the present expansion strip is adapted to be used with parting-strips in a number of different ways.- f

Referring to Fig. 5, this is another modified expansion joint in which the parting plate 15 consists of a plane strip of sheet-metal which is resiliently clamped between the flanges 32 and Z8 of Vexpansion strip 22. The filling for the cylindrical beads 29 and 30 is provided by the wires 16, 11, but in order to insure the maintenance of these wires in Aproper position the wires 18 and 11 are supported by a yoke 18 comprising la. U-shaped trough of sheet metal. having its upper edges curled about the wires 16', 11.

The lower part of the yoke 18 engages the concrete below it,v which positively prevents" the' parting plate 23.

dropping` of this yoke when the flanges 21, 3| and 28, 32 are separated under abnormal conditions.

Referring to Fig. 6, this is a similarview showing a modified form of template in which the tem- -plate body 4| is provided with a sheet metal member 19fof a. shape complementary to the inside of the expansion strip 22. The sheet metal member 19 is xedly secured to the template body 4| bythe screws 80, and it telescopically engages between the flanges 3| and 32.

Referring to Fig. 7, this is another'modiflcation in which the flange 32 is provided with a rib 8| for the purpose of more firmly engaging the If desired, the parting plate 23 may be formed with a complementary grooved or stamped formation for receiving the rib 8|.

Referring to Fig. 8, this-modification of the same type of expansion strip 22 may be used with a pair of' separate division plates 82, 83. Division plates 82, 83 are preferably formed with lother by the respective flanges 28, 32 and 21, 3|.

The enlarged space 88 adjacent the main fold 33 positively prevents the division plates 82, 83 from engaging and pinching the main fold 33. The division plates 82, 83 are provided with apertures 81 for receiving dowel pins 88 which may be provided with metal caps 89 located in one of the concrete sections 20, 2| so as to make provision for the telescopic engagement of the dowel pins 88 in one of the sections of concrete.

'This expansion joint provides for the initialexpansion of the sections of concrete and permits expansion and contractionof the joint for long periods of time'without any possibility of the folds being bent into sharp creases or cracks.

Referring to Fig. 9, this is another modification. in which expansion strips 22 are used at the tno and' bottom of the concrete. 'I'he parting plates 90, 9| are provided with 'offsets at 92, 93, forming enlarged spaces at 9,4 adjacent the main folds 33. The extent of expansion per- .mitted is equal to the space between the main portions of the division plates 90, 9|, which may cause the fold 33 to bulge downward, but the fold 33 can never be pinched between adjacent sections of concrete.

Fig. v10 is another modification, in which the same typeof division plates may be utilized, but

the shape of the main fold 33 of the expansion dinally extending grooves 99 for receiving `a dowel plate |00. The dowel plate |00 is of less Width than the space between the ends |0|, |02 of the grooves 99 so as to leave space for the ini- Atial expansion of the concrete sections 20, 2|,

and the dowel plate |00 is adapted to maintain the sections 20, 2| inv substantial alignment.

Referring to Fig. 12, this is an expansion joint having a similar expansion strip 22, but the parting plate ||9 comprises a pair of parallel lflanges |20, I2| bent back against eachother anzi.` leaving the outwardly bent portions |22, |23 to bring the upper flanges |24, |25 into position to be engaged between iianges 21, 3| and flanges 28, 32. 'I'he offset portions |22, |23 form an enlarged space |26 around the main fold 33. The main body of the parting strip H9 need not be as wide as the depth of -the concrete, since the crack 38 will result from the weakening of the concrete at this point.

Fig. 13 is another modified form of expansion joint in which the same expansion strip 22 is used with a pair of guide plates |03, |04. Guide plates |03, |04 are provided with offset portions |05 bringing the flanges |06, |01 into closer proximity tothe flanges |08, |09. The flanges |06, |01 may resiliently engage a cellular or corrugated cardboard spacing member H0, which is adapted to prevent the space between the sections 20,v 2l from being filled with concrete, but which can be crushed by the concrete as it expands. y

Fig. 14 is another modified assembly in which the guide members |03, |04 have been omitted and the cellular filler ||2 is engaged directly by the flanges 2'| and 28.

In the modification of Fig. l5, the expansion strip 22 is provided with backwardly bent flange and a downwardly extending guide flange I4. The flanges 24 and l|3 are joined by an enlarged bead ||5 which provides an anchoring formation. Another mode of construction is shown lat the right side where the angle iron guide member ||6 is spot welded to the flange 25 and provided with a downwardly extending guide flange I1 for supporting the cellular filler It will thus be observed that I have invented a plurality of improved forms of expansion strips,

parting strips and expansion -joint assemblies, in which provision has been made for initial expansion, initial contraction or both. 'I'he present expansion strips are peculiarly adapted to eliminatethe tendency of the strips of the prior art to cause sharpfolds or creases between the flanges of the expansion strips after the adjacent spaces have been filled with dirt, sand or other sharp, solid and incompressible material.

While I have illustrated and described a pref'erred embodiment of my inventionnnany modifications may be made without departing from the spirit of the invention, and I do not wish to be limited to the precise details of construe? tion set forth, but desire to avail myself of all changes within the scope of the appended claims..

Having thus described my invention, what I claim lis new and desire to secure by Letters Patent of the United States, is:

1. In an expansion joint, the combination of a pair of' sections of concrete with an expansion strip having anchoring portions embedded in each of said concrete sections, a. pair of substantially parallel flanges joined together to form a main expansible fold, anda pair of substantially cylindrical beads joining said parallel flanges with said anchoring portions.

2. In an expansion joint, the combination of a pair of sections of concrete with an expansion strip having anchoring portions embedded in cach of said concrete sections, a pair of substantially parallel flanges joined together to form a main expansible fold, and a pair of substantially ,cylindrical beads joining. said parallel flangesi` with said anchoring portions, said beads being provided with relatively incompressible filler to prevent forming a sharp crease at said beads. l

3. In an expansion joint, the combination of an expansion strip having a main fold with a iary flange engaging `each of said parallel flanges,

pair of substantially parallel flanges, an. auxilanchoring flanges carried by said auxiliary flanges, la parting strip clamped between one of said parallel flanges and said auxiliary flanges, and substantially cylindrical formations joining each of said auxiliary flanges to one of said parallel flanges.

4. An expansion joint comprising a pair of adjacent sections of concrete, an expansion strip having an anchoring flange extending into each` section of concrete, an upwardly extending flange carried by each of said anchoring flanges, a sub-v adjacent sections of concrete, an expansion strip having an anchoring flange extending into each section of concrete, an upwardly extending flange carried by each of said anchoring flanges, a substantially cylindrical beadv carried by each of said upwardly extending flanges, and a pair of downwardly extending flanges joined together to form a main expansible portion of saidexpansion strip, said cylindrical beads being embedded in said concrete sections. v

6. An expansion joint comprising a pair of adjacent sections of concrete, an expansion strip having an anchoring flange extending into each section of concrete, an upwardly extending flange carried by each of said anchoring flanges, a substantially cylindrical bead carried by each of said upwardly extending anges, a. pair of downwardly extending flanges joined together to form a main expansible portion of said expansion strip, and a pair of separate parting plates, each parting plate being resiliently clamped between an upwardly and a downwardly extending flange of lsaidexpansion strip. 7. An expansion joint comprising a pair of adjacent sections of' concrete, an expansion strip having an anchoring vange extending into each section of concrete, an upwardly extending flange carried by each of said anchoring flanges, a substantially cylindrical bead carried by each of said upwardly extending flanges, a pair of' `downwardly extendlng flanges joined together to form a. main expansible portion of said expansion strip, and a pair of separate parting plates, each parting plate being resiliently clamped between an upwardly and a downwardly extending flange of said expansion strip, said parting plates being formed with oset portions to provide an enlarged space around said main expansible portion.

8. An expansion joint comprising a pair of adjacent sections of concrete, an expansion strip having an anchoring flange extending into each section of concrete, an upwardly extending flange carried by each of said anchoring flanges, a substantially cylindrical bead carried by each of said upwardly extending flanges, a pair of downward ly extending flanges joined together to form a main expansible portion of said expansion strip, -and a cellular spacer located beneath said main expansible portion for spacing said concrete secadapted to be crushed by the expansion of the concrete sections.

9. An expansion joint comprising a pair of adjacent sections of concrete, an expansion strip having an anchoring flange extending into each section of concrete, an upwardly extending flange carried by each of said anchoring flanges, a substantially cylindrical bead carried by each of said upwardly extending flanges, a pair of downwardly extending flanges joined together to form a main expansible portion of said expansion strip, a cellular spacer located beneath said main expansible portion for spacing said concrete sections from each other, said cellular spacer being adapted to be crushed by the expansion of the concrete sections, and a pair of guide plates carried by said expansion strip and adapted to en- `4anchoring fianges, a substantially cylindrical bead carried by each of said upwardly extending flanges, a pair of downwardly extending fianges joined together to form a main expansible portion of said expansion member, and a. pair of spaced parting plates having their upper edges secured to said expansible member to form an air space between the sections of concrete.

11. In a concrete road joint the combination of a pair of adjacent sections of concrete with'an expansion member having an anchoring flange extending into each section of concrete, an upwardly extending flange carried by eachoi.'A said anchoring iianges, a substantially cylindrical bead carried by each of said upwardly extending flanges, a pair of downwardly extending flanges joined together to form a main expansible portion of said expansion member, and a pair of spaced parting plates having their upper edges secured to said expansible member to form an air space between the sections of concrete, said parting plates being formed with o'set portions to provide an enlarged spacev around said main expansible portion. Y

12. In a concrete joint forming member, the combination of a pair of sections of concrete with a flexible metallic seal for closing the space between the sections, said seal having a. pair of laterally projecting anchoring anges, one of which is anchored in each concrete section, and

having upwardly-extending flanges located ad.

jacent the edges of the concrete sections, beads formed at the edges of said upwardly extending flanges, and a pair of downwardly extending flanges integrally joined together, extending from said beads and forming a medial expansible portion, and a lling of semi-plastic material arranged over said medial expansible portion.

13. In a concrete joint forming member,` the combination of a pair of sections of concrete with a flexible metallicseal for closing the space between the sections, said seal .having a pair of laterallyi projecting anchoring flanges, one of which isanchored in each concrete section, and having upwardly extending flanges located adjacent the edges of the concrete sections, beads formed at the edges of said upwardly extending `fiangeaa pair of downwardly extending flanges i integrally joined together, extending from said beads and forming a medial expansible portion, a filling of semiplastic material arranged over said medial expansible portion, and an air space forming core comprising a pair of upwardly extending sheet metal vwalls joined together at the bottom and located at the top between the upwardly extending flanges and the downwardly extending iianges of said flexible seal.

14. In a concrete joint forming member, the combination of a pair of sections of concrete with a flexible metallic seal for closing the space between the sections, said seal having a pair of laterally projecting anchoring flanges, one of which is anchored in each concrete section, and having upwardly extending anges located adjacent the edges of the concrete sections, beads formed at the edges of said upwardly extending flanges, a pair of downwardly extending flanges integrally joined together, extending from said beads and forming a medial expansible portion, a lling of semipastic material arranged over said medial vexpansible portion, an air space forming core comprising a pair of upwardly extending sheet metal walls joined together at the bottom and located at the top between the upwardly extending flanges and the downwardly extending fianges of said flexible seal, and means located at the upper ends of said walls in said beads for filling said beads to prevent the crushing of the beads.

15. In a concrete joint forming mechanism, the combination of a pair of concrete sections formed with a vcrack between them, with a iiexible sealing member, said iiexible sealing member having an intermediate expansible portion and having laterally projecting anchoring flanges embedded in the concrete sections and a reserve expansible portion formed between one of said anchoring flanges and said intermediate expansible portion, said reserve expansible portion being anchored in a concrete 'section and adapted to be drawn out of the concrete section when the concrete expands sufficiently to require the reserve expansible portion of said seal.

16. In aA concrete joint forming mechanism, the combination of a pair of concrete sections formed with a crack between them, with a exible sealing member, said flexible sealing member having an intermediate expansible portion and having laterally projecting anchoring flanges embedded in the concrete sections and a reserve expansible portion formed betweenv one of said anchoring ilanges and said intermediate expansible portion, said reserve expansible portion being anchored in a concrete section and adapted to be drawn out of the concrete section when the concrete expands sufficiently to require the reserve expansible portion of said seal, said reserve expansible portion comprising a pair of substantially parallel walls formed with a bead at their adjoining edges, and the bead being anchored in a concrete section.

17. In a concrete road joint forming member, the combination of an expansion strip having a medial exible expansible portion terminating in beads at its upper edges, one of said beads being filledwlth a -wire flller, downwardly extending flanges carried by said beads and having anchoring wings anchored in the adjacent sections of concrete, and a parting strip having a wire filled bead at its upper edge, the bead of saidparting strip being secured in the bead of said expansion strip.

18. In a concrete joint foi-ming member the combination of an expansion strip having a medial flexible expansible portion terminating in beads at its upper edges, one of said beads being filled with a wire filler, downwardly extendingl flanges carried by said beads and having anchoring wings anchored in the adjacent .sections of concrete, and a parting strip having a wire iilled bead at its upper edge, the bead of said parting strip being secured in the bead of said expansion strip, said downwardly extending Hanges having inwardly extending edges and said parting strip having a complementary ridge for engagement and securement of said parting strip to said expansion strip.

I9. In a concrete joint forming device, the combination of a flexible seal formed with a pair of anchoring anges adapted to be anchored in two adjacent concrete sections, a pair of upwardly extending walls extending one from each of said anchoring anges and metallic beads formed at the upper edges of said walls and joined to depending walls which are joined together to form a medial expansible portion, a parting ystrip arranged between two of said walls and supported thereby in position to form a crack `between adjacent concrete sections, said parting strip having means formed therein for engaging a part of said exl0 ible seal to assure its retention between said walls.

CuFFoRD OLDER. 

